Metal and graphene hybrid metasurface designed ultra-wideband terahertz absorbers with polarization and incident angle insensitivity

Abstract

In this research, a new technique for ultra-wideband (UWB) absorber design is proposed. Our design approach includes a metal metasurface and a graphene metasurface. It is found that the hybrid metal and graphene metasurfaces trap very wideband EM waves in the structure, which contributes to UWB wave absorption.

Recent progress in two-dimensional materials for terahertz protection

“…In order to further expand the THz response bandwidth and strengthen the THz absorption capability of the THz protection materials, it was also an effective method to combine graphene with other THz responsive materials, such as metals [18,[79][80][81][82][83][84][85][86][87][88], Si [89][90][91][92][93], water [94] and other materials [95,96]. By reasonably designing the meta-structures of each component, the comprehensive advantages of each material could possibly be utilized.…”

Classification and characterization of electromagnetic materials

“…Recently, researches focus their efforts on the study of the interaction of electromagnetic fields with complex materials in the terahertz frequency ranges for possible new applications and devices. Terahertz investigations of structures like graphene-dielectric stacks 42 , metal and graphene hybrid metasurface 43 , organic crystals for THz photonics 44 , terahertz metamaterials 45,46 and chiral metamaterials 46 are few examples of such efforts. The methods presented in this paper are general and can be applied to any frequency band; still it is demonstrated here at the terahertz bands.…”

Non-Layered Gold-Silicon and All-Silicon Frequency-Selective Metasurfaces for Potential Mid-Infrared Sensing Applications

“…However, due to significant energy loss in the metal host and incomplete phase coverage, such configurations have been used mostly for proof-of-principle demonstrations rather than standalone applications. All that changed with the introduction of hybrid [ 47 , 48 ] and all-dielectric [ 49 ] metasurfaces, which were able to circumvent most of the disadvantages of the all-metallic counterparts. By comparison to the classic (metalli( c ) architecture, hybrid metasurfaces introduce a new degree of freedom in the meta-atom configuration, by establishing an imbalance between the permittivities and permeabilities of the j material elements of the cell.…”